99 Deville 54k original Mi. Head Gaskets replaced by Dealer. Since then I have put 80 miles on car and back in shop 5 times. They replaced 2 wire harnesses and ECBTM. They can't seem to fix it. They have done road tests with Tech 2 in place. Replaced also a wheel bearing and a sensor, don't know why because I have had no howling noise. Getting aggrivated.
This time car at dealers 3 weeks now--need advice- is it time for the BBB
I am having the same problem. cadillac dealership replaced the head gaskets and when i got my car back the abs and traction control lights were on.they said they did nothing to cause this. yeah right!!!!!!!! they have replaced the wiring harness to the wheel speed sensor, still did not help. they said it would be the ECBTM. i am also tired of the classic BOSS HOG garage so never go to Rooster Bush Cadillac in Morganton NC. i also need some honest advice, so if i hear any i will pass it on to you and i hope you will do the same for me. FRUSTRATED 1
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It is probably a head gasket issue if you have replaced the thermo and the pump and it still overheats. You probably can drive it 15 minutes or so and then the gauge starts soaring towards overheat shortly there after. Under completely normal driving conditions. Northstar engine's actually don't overheat not from bad head gaskets (they aren't the defect issue) but the inferior bolts holding the heads to the block. The bolts have been found to be pulling out of the Northstar's soft aluminum block(this is the actual problem but it's blamed on the gaskets). Causing spaces between the block, gaskets and the head that allows hot exhaust air to seep into the coolant flow chambers. This why your have coolant bubbling out of the top of the overflow valve under the hood after only short drives. Under normal operation the engine is literally boiling it's own water supply. The head bolt issue is a design flaw by GM and one that leads to a great number of Northstar engines being crippled at well under 100K miles of driving. Only remedy is to have both heads pulled off the engine, the head bolt replaced with new gasket and you're all set. Bad new very labor intensive whcih = a several thousand dollar repair. I had it happen to my 1998 Concourse Deville. I feel your pain.
poor choice if purchased. The head bolts tend to break and to have it repaired is very costly for they are slender and long. . A 99 Cadillac is too old for they have many modules operating this vehicle and the shocks themselves run nearly $1000 each. Back off on this deal
If you have no obvious external coolant leaks then the most likely culprits would be leaking head gaskets or warped heads. I would take the car to an engine rebuilding shop and get a second opinion to the dealer, not to say that they are wrong, but your engine may be salvageable at a cheaper cost and those guys would be better positioned to tell you that. Hope this helps.